Examine the muscles of the upper portion of the anterior (flexor) compartment of the arm (Figure 6.5). Identify the coracobrachialis muscle, short head of biceps brachii muscle, long head of biceps brachii muscle, and brachialis muscle [probe].

Retract the biceps brachii muscle and examine the attachments of the brachialis muscle. (An option is to cut the biceps brachii muscle approximately 5 to 10 cm above the elbow and reflect the upper portion of the biceps brachii muscle laterally]). The brachialis muscle [probe] lies deep to the biceps brachii muscle [held by forceps]. The brachialis muscle originates from the anterior surface of the humerus and intermuscular septum and inserts into the coronoid process and tuberosity of the ulna.